Catalytic Reforming of Fuels Over Noble Metal-Coated Honeycomb Monoliths: Capillary-Based In-Situ Sampling Technique

Beschreibung

Hydrogen is applicable to many processes, e.g. as a basic chemical for the production of value-added chemicals and as a direct fuel in fuel cells for power generation. The production of hydrogen is possible from various feedstocks, both fossil and renewable. For on-board hydrogen production, e.g. in airplanes and vehicles, rapid start-up, transient response, and compact reactor design are important criteria. Reformers on the basis of catalytic partial oxidation (CPOX) meet these requirements and therefore represent an attractive option for onboardapplications. This work focuses on high-temperature catalysis (T = 900 - 1200 K) in CPOX reactors with short contact times (t ˜ 10 ms). The performance of CPOX reformers was investigated for a broad range of fuels: methane (main component of natural gas), propane (main component of LPG - Liquefied Petroleum Gas), ethanol (renewable fuel), and 95 RON gasoline and E 85 (ethanol-blended gasoline). The catalyst used in these investigations was a Rhcoated honeycomb monolith. An additional study on CPOX of methane was performed on a two-stage catalyst based on Pd and Rh. For a detailed insight into the reaction network during CPOX of the different fuels, an in-situ sampling technique was constructed. With this technique, axial concentration and temperature profiles are detectable in one channel of the honeycomb monolith. The investigated channel is freely selectable from all channels of the monolith. Thus, the influence of heat loss on the system can be studied in detail. However, the in-situ technique influences the measured data because of the positioning of the probe in the channel. To evaluate the influence of the probe on the collected data, CFD (Computational Fluid Dynamics) simulations were performed. These investigations revealed the source of the measuring error and made it possible to quantify the error.

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Claudia Diehm

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